5. In the boiler shop of an electric power plant, 62 t of hard coal with calorific value Q=28.9 MJ/kg were burned during 20 hours of operation. Determine the average electric power of the plant if only 18% of the heat from the coal combustion is converted into electrical ener- gy.

To determine the average electric power of the plant, we need to follow these steps:1. **Calculate the total energy released from burning the coal:** - The mass of coal burned is . - The calorific value of the coal is . The total energy released from burning the coal is: 2. **Calculate the useful energy converted into electrical energy:** - Only of the heat from the coal combustion is converted into electrical energy. The useful energy is: 3. **Convert the useful energy into electrical power:** - The plant operates for 20 hours. The average electric power is: Therefore, the average electric power of the plant is .